Punching device



June 19,1945. c. F. LEHMEIER PUNCHING DEVICE Filed Feb. '7, 1944 28 INVENTOR. CARL F; LEHMEIER 'BY' 5 w Anonwsy ers or the template. a

Patented June 19, 1945 2,378,777 e e PUNCHINGDEYICE: .Carl F. Lehmeier, Santa Monica: Calif., assignor to Douglas Aircraft Company, Inc., Santa Monica, alif.

" Application February 7, "1944, S erialNo 52 1350 (oi. lei-.94)

i .11 Claims.

1 This invention relates to a punching device'of the type in which the and die are assembled in a holder which can be .quickly clamped inadjusted position on the bed of a power press, and which is believed to be an. improvement on the punching devices disclosed in thepatents to Wales,"Nos. 1,955,866, 2,163,651, and 2,323,431. i l

punch, stripping means,

' One object of myi nvention i to provide a punching device which will shorten the time required toset up aseries of punching devices in a power press with the punches in precise vertical alignment with the corresponding openings of a "template. l v n 1 Another object is to provide a punching device in .Which the holder can bereadily shifted or removed for replacing a broken punch, die or stripping means, without disturbing the adjacent hold- Another object isto provide a punching device ,ln which the punches of 'a plurality of. adjacent holders can be quickly aligned with the correspending openings of a template, regardless of 1 whether said openings are in a straight line or are 25 offset varying distancesfrom either side of a straight line. i v

Another object is to provide a punching device H with a die having means projecting from the bottom thereof for aligning the punchwiththe correspending opening. in the template.

An additional object is to provide a simplified iform of die, punch, and stripping'means; so that any element of the set can be readily replaced. 1 either in the event of breakage, or for substituting punching an opening of; a different size or shape.

a different set in the holder for It is also an object of my invention toiprovide a punching device in. which the aligning means of each :punching device remains associated with Figure 4"is a horizontal sectional view on line 4-4 of Figure 3 with the template removed,

of Figure 3, and

Figure 5is avertical sectional view on line 55 Figure 6 is an enlarged view'in section of the aligning means of a punching device of the present invention showing the aligning means disposed in anvopening of. the template.

J a In Figure 2," the punching device l'fl is shown securedbetween the ram l l 1 and bed I2 of a conventional power press, the details of which constituteno partof my invention,since any form of i power press towhichthe device can be bolted or clamped may be employed. The punching device 10 comprises aholder |4, a punch l6, :3. die' [8,

i a stripperspring 20, and aconventional fastening bolt. The head of theffasteningbolt 23 is slidable along either or the slots l3 for adjustably positioning a device on the bed l2.

The holder l4 comprisesa lower die supporting member 24.and an upper supporting member 36 .for the punch l6 and spring 20. The lower supporting member 24 is'provided with an elongated vertical slot 25 for receiving the fastening bolt 23 tolthe end that the holder may be slidably adjusted transversely of the bed. The supporting member 24is formedwith a recess 26 in itsbottomface to accommodate a template 2'! which is retained in clamped positionbetween said arm 24 and bed l3.

The front portion of the recess is more shallow than the intermediate portion, and has a depth substantially equal to the thickness of the template 21. The template .2! may be of any desired form but is shown asa flat sheet provided with openings 28 accurately located with respect to each other. In'order to reproduce the template 1 openings 28 in the same relative position in the the corresponding opening in the template during use for; facilitating setting up or replacing the devices by unskilled and inexperienced operators. A further object of my invention is to provide an improved and simplified form of holder, punch, g stripping means and die which can be manufactured economically. 1 n

Inthe drawing:' 1

Figure 1 is'a perspective view of the punching device secured in a press bed,

Figure 2 is an end elevation of Figure l, with the ram added, 7 i

'Figure 3 is a vertical section view on the longitudinal center line of the device,

place on a conventional power work to be punched," the punches l6 and dies l8 must be precisely aligned with the template openings 28, which required considerable time by an experienced operator inpriorart devices. The

useof my device simplifies the aligning operation,

and is especially useful whenever it becomes necessary to replace a broken punch,.or to substitute a punch and die set for -a different size or shape of opening. H i

As shownin Figures 2 and 3, the die [8;preferably made cylindrical in shape, isprovlded with av locating lug 29 p'rojectingfrom its bottom face for entering template openings 28, and with a die opening 30 in its upper end, the die opening 30 communicating with recess 3| for disposing of the scrap pieces, and being aligned vertically with lug 29. 1 The lower endof the die I8 is made largerindiameterthan the upper end to provide 1 i a shoulder 33, which coacts with a stop shoulder 34 formed in the free end of arm 24 by making the upper portion of vertical bore 35 smaller than the lower portion. The enlarged lower end of the die [8 is firmly held against vertical movement by said stop shoulder 34 when the bottom face of the die I8 is clamped against the upper face of the template .21, while...the retention..of-lng.29-in a template openingilhassists the fastening bolt 23 in preventing lateral movement of die l8 and holder l4.

As shown in Figures 2, 3, and 5, the upper supporting member 36 has vertically spacejdarmsifl and 38 at its front end, said arms being provided with vertically aligned boresgforgslidablylmonnting punch H5 in vertical alignment with tile opening 30 and locating lug 29. A stripping spring 20 surrounds the punch I6 for'iliiting'ithe;"punchibit out of the perforation formed in the work Jay. the punching operation. In order to accomplish "its against the upper .face .of loWerarmi-IB; whilethe upper ,end abuts-against a drift-pin 39 extending through the punch l6 and normally eseatingtin :of "the: upper-arm: 3,1- l

:oInmthe :operation. :o'fomy inventionnas imany punching devices l0.will.beiemployedzastherezare zholes zto ibespunchediinxithe work. Ellie itemplate 11:21; with the; openings; 2flzaccurately locatedtinathe rsameirelativeposition.as.:therholesiwhichzarezre- :quircdatorhepun cheddmthe'wo'rk; is; pl acedron-sthe 1shedijszzofiapowerrpress; ',.A':punching device-1 lr-for to'itheabed l2 :thetemplatet being clamped between "therurideresurfaces."of the supporting memberiid randvxthe top-'surfaoeof the bed,=-withthe lug-129cm iithesbottomtface ofveachfdie 8,:1ocated:inrtsporresponding opening 328" irr-theztemplateitfl. ifThe atemplate willcbezsecurely'held: againstzrmovement .iwhen all. of i the punching 'devices have-been sezcurediin :place. The :work" (not shown) is :now

replaced xon 1 top cofrithe adjacent die merrrbers LI 8, i-againsti conventional: stop members (riots-shown) eif- .;nec.essary,-s and the press: is :operat'ed-itoaforce :the -ram' H down onfithe :punche's t6: against the combined :resistance of the .rzsprings 92.0 :1 until "the iWQTk'iS perforated. The ,ram "I I :is :then withfrirawn w-the springsi2 01 strip the tpunehesrl 6: from 'wthecworkby gliftingleagainstcthe drift pinsi39. and

:ithe workzisreplaceid. l

insithetemplateiis clamped against .the ;top=sur :face; of "the bed by: the 'spunching :devices -;.of the ,i'preserit invention, .avpunching device ;ca.n :be re- :moved without 1 disturbing :theztemplate for the :-:remaining punching; devicesowill securelyhold f/theitemplate :against movement; Thus the zoperation .:.of: again "aligningctheritemplate after a ipunchingrdeviceiis removed, :as' is necessary; .-with previously proposed: .tdevicfes; ';.-1S :obviated. This 'sffeature :of :thetinvention:greatlyzreduces:theltime of 'anyjoperational -run 'f.or:it .notvonly1 eliminates theinecessity of re-aligningZth ttempIate; which 1 must. be done .by a skilled operator; but: also'rpermits irelatively unskilled. operatorsito bewassigned to the press. The claimsare intended :to eover all 'changes and modificationsllwhich may-.be fairly regarded 'as coming within' theiriscope. I claim: -i'1.' A-:-punching device cornprisingra holder; a

punch, :a stripping means, and-cooperating Edie means assembled in the "front "-portion -ofsaid hoIder the front portion of the bottom face: of

'said' kholder being recessed for a receiving a: template; a die opening in said die means; and means projecting from the bottom of said die means and into said recessed portion of said holder for aligning the punch and die opening with the corresaid holder.

2. A punching device comprising a holder hav- "'tom face of said lower supporting member being erecessed for receiving a template; a vertically disposed elongated slot in said lower supporting '15 1.

' means; andcoonerating die means carried by the memberi for ailjustably receiving an attaching front portion of said lower supporting member.

-:3. :Apunching1device comprising a holder havinganupper supporting portion and a lower supzo porting portion; the front portion of said upper ssimportingimember carrying a puncheand: asstripispingrmeans the fronti ortionsof athebottomifa'ce so lsaid\lower;supporting;'portiombeing? ecessed .ifor receivinggaetemplate ricooperating edieimeans :carried iby' ithe: frontyportion ofesaiddowem sup iporting member t a die opening inisaidndielmeans; (and :meansgprojecting from;thebottomxofisaidil'li means and into said recessed portion ofisaid'rlowersupportingmember for aligningzthegpunch and (3Q gtheedie opening a with the corresponding; opening in the template,.associatedmithsaid holder.

Q ingian.upperielongated punch supporting-memher and a lower elongated die supporting .Inicm- ,.ber,, v,theiront and intermediate nortionbf the bottomg'face of.said;1ower..s1ipportiri membergloeing. recessed-for receiving .a.template;r.a vertical- Lily disposed elon ted.slotgextendingrthronghithe intermediate portion of saidlowergsnpnorting member ,for, adiu tably r ceiving .an. attachin "member; and a vertically gdisposed hole in the front portion of I said lower; supporting mfimber -forreceivingsaiddie.

*5; Apunching device compri 'ng. a'l'rolderhav- *ing an "upper "punch "supporting member; (1 a lower diesupportingmember; the *front .andjlintermediate portion, of the bottom"fac efoffsa'id lower supporting member b'eingi recessed" for reoeiving atemplate; a"verticallyextendingboreiin "the frontportion df saidlower supporting her; and a -vertica'lly disposed cylindrical' *m'ember in "said bore,- said"die member ihaving a die opening in its upper end and a downvrardly projecting' lug on its lower end aligned with said opening; said lug projecting into -said recessed portiomfor aligning the punch' and 'riie -openi fr1g with the corresponding opening inthetemplate associated with said holder; v I

-"'-"6.-A:punch-ing device comprisinga holderlhaving =an='elongated upper supporting -memberwand f 'a "lower elongated I die supporting inemloerythe front cportion' of wsaicl :upper supporting; member shaving. verticallygsspaced armsvprojecting J-ho'rinzzontaliy therefrom fzorsupporting? aepunch'; the rentand:"intermediateiportionisofx the'obottom tfiace.rofrsaidtlower;facabeing recessed for il'fiGiV- ing a template; a vertically,itlisposed 'eldngated slot extending through the intermediateiportion cofisaid lower.=supporting:rmember efor :adsin'stably 70 :rreceiyingiarr-attaching member; andiazrvertically extending bore in the front portion o'fesaidalowter ,zsuppo-rting memberfor :re'ceiving --a die means in sponding opening in the template associated with '7. A punching device comprising a holder;

cooperating punch and die means carried bysaid holder; means projecting below the lower surface of said holder for aligning the punch and die I means with a corresponding opening in altemplate; one portion of said holder being adapted said holder towards said bed plate whereby said to engage the surface of said template and another portion being adapted to engage the bed plate of 9, press; and retaining means to draw template is clamped-between said holder and said bed plate to align said punch and die means I with the opening in the template.

8. A punching device as claimed in claim 7,

in which said first and second portions of said holder are in spaced substantially parallel planes to accommodate the thickness of the template clamped between the holder and the bed plate.

9. A sheet material perforating apparatus for use between the bed and ram of a press, comprising a holder having a base and an upper head, and a perforating device mounted on said base and head and adapted, to form holes in a sheet placed between base and head upon moving said bed and ram one relatively to the other, said perforating device comprising a lower die mountedto said base and a punching unit slid able vertically in a guide openingin said head and having a punch adapted to cooperate with said die; means having a predetermined position relative to said die and extending below the underneath surface of said base for locating said punching unit and die in a predetermined position relative to an opening formed in a template disposed beneath said base: and means for clamping the templatebetween the underneath surface of said base and the upper face of said bed.

10, A sheet perforating apparatus for usebetween the bed and ram of a press, comprising:

a holder having a lower base and an upper head, i

and a perforating device mounted on said base and head and adapted to formholes in a sheet placed between said base and head upon moving ;I

said bed and ram one relatively to the other,

said perforating device comprising a die mounted to said base and a punching unit slidable vertically in ag uide opening in said head and having a punch adapted to cooperate with said die, the underneath surfac of said base being formed with horizontally spaced parallel faces vertically separated a distance equal to the thickness of a template to be mounted between said base and the bed of the press; means projecting below the upper face of the "underneath surface of said base for aligning the punch and die with a corresponding opening in said template; and means i for clamping the base to the bed of the with the'template therebetween.

11. A punching device for use betweenthe bed press and the ram of a press comprising a holder; a

tending face for aligning the punchand die with a locating opening in a template placed between said lower surface and the bed of said press.

CARLF, llEI-IMEIER. 

